Navegando por Assunto "Mata Atlântica"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise filogeografica e populacional do gênero Corythopis sundevall, 1936 (Aves: Rhynchocyclidae)
(Universidade Federal do Pará, 2012) SOUSA, Shirliane de Araújo; ALEIXO, Alexandre Luis Padovan; http://lattes.cnpq.br/3661799396744570; SANTOS, Marcos Pérsio Dantas; http://lattes.cnpq.br/7941154223198901
The genus Corythopis, family Rhynchocyclidae, has several taxa whose limits and validity are still doubtful, generating uncertainty about the actual amount of diagnosable evolutionary units within the group. This genus has two species: Corythopis delalandi, monotypic and distributed in the Atlantic Forest and Cerrado biomes, and C. torquatus (endemic to Amazonia), in which three forms are recognized, characterized and distinguished from each other by the pattern of shades of brown on the head: C. t. torquatus Tschudi, 1844; C. t. anthoides (Pucheran, 1855), and C. t. sarayacuensis Chubb, 1918. The objective of this study is to reconstruct the temporal and spatial contexts of the diversification of the genus Corythopis, allowing inferences about the evolutionary history and inter and intraespecific boundaries of the group. We performed phylogeographic (ML and IB) and population genetics analyzes based on a mitochondrial marker (ND2), and estimated a species tree for lineages within Corythopis with two nuclear (MUSK and βf5) and mitochondrial (ND2) markers. According to the results observed, there are five main filogroups of Corythopis endemic to the following regions (neotropical areas of endemism): 1- Xingu, Tapajós e Rondônia (north; east of the Jiparaná); 2- Napo; 3- Guiana; 4- Inambari e Rondônia (south, west of the river Jiparaná) e 5- Mata Atlântica. The results of phylogenetic and population genetics analyzes indicated the existence of two reciprocally monophyletic clades supported by high bootstrap support (>80%) and posterior probabilities (> 0.95), thus agreeing with the current taxonomy of the genus Corythopis, which recognizes an Amazonian (C. torquatus) and an Atlantic Forest / Cerrado biological species. The species tree agrees with the other analyzes showing that there are only two reciprocally monophyletic lineages in Corythopis with high statistical support: C. torquatus (F1, F2, F3 e F4) and C. delalandi (F5), reinforcing their status as independent biological species. The biogeographic pattern of separation between the different filogroups of Corythopis in the Amazon is quite different from that reported to date for different lineages of Amazonian birds, whereby the initial separation events involved populations from the Brazilian and Guianan shields.
Acesso aberto (Open Access)
How a simple and stereotyped acoustic signal transmits individual information: the song of the White-browed Warbler Basileuterus leucoblepharus
(2004-06) AUBIN, Thierry; MATHEVON, Nicolas; SILVA, Maria Luisa da; VIELLIARD, Jacques Marie Edme; SEBE, Frederic
The White-browed Warbler Basileuterus leucoblepharus, a common bird of the BrazilianAtlantic forest, emits only one distinct song type in the context of territorial defense. Individual or neighbor-stranger recognition may be more difficult when birds share similar songs. In fact, the analysis of songs of different individuals reveals slight differences in the temporal and the frequency domains. Effectively, a careful examination of the signals of different individuals (21) by 5 complementary methods of analysis reveals first, that one or two gaps in frequency occur between two successive notes at different moments of the song, and second, that their temporal and frequency positions are stereotyped for each individual. Playback experiments confirm these findings. By propagation experiments, we show that this individual information can be only transmitted at short range (< 100 m) in the forest. In regard to the size and the repartition of territories, this communication process appears efficient and adaptive.
Acesso aberto (Open Access)
Revisão sistemática do gênero Myiobius Gray, 1839 (Aves: Onychorhynchidae)
(Universidade Federal do Pará, 2018-01-23) AZEVEDO, Saulo Borges de; CARNEIRO, Lincoln Silva; http://lattes.cnpq.br/4455914557656334; SANTOS, Marcos Pérsio Dantas; http://lattes.cnpq.br/7941154223198901
This work presents a phylogenetic study on the Myiobius genus, a passerine group recognized to Onychorhynchidae family, We estimated the evolutionary relationships among their species, as well as intraspecific analyzes in two of them, it was possible to recover their subespecies relationships, and biogeographic barriers influence, as rivers, in their diversification. For this, two mitochondrial markers (ND2 and COI) and two nuclear loci (ACO1 and βfib5) were used from 90 individuals with a wide distribution in South and Central America. The data confirmed reciprocal monophyly between lineages from west and from east of Andes; We recovered close relationship between M. barbatus / sulphureipygius / villosus species, and evolutionary distance of M. atricaudus; moreover, two of its sympatric and cryptic species (M. barbatus and M. atricaudus) still hybridize to each other, although they have been recovered as evolutionarily distant. It was verified that main Amazon basin rivers influenced the diversification of genus species, recovering populations from different interfluves as distinct evolutionarily from others.
Acesso aberto (Open Access)
Variação morfológica de Imantodes cenchoa (Linnaeus, 1758) (Serpentes, Dipsadidae) na América do Sul, com a descrição de duas novas espécies
(Universidade Federal do Pará, 2014) MISSASSI, Alexandre Felipe Raimundo; PRUDENTE, Ana Lúcia da Costa; http://lattes.cnpq.br/1008924786363328
Imantodes comprises a group of primarily arboreal snakes, with large Neotropical distribution, clustering seven species currently recognized, with great color variation. Imantodes cenchoa presents has the highest distribution (southern Mexico to northern Argentina). The need for studies on the morphological variation of I. cenchoa in South America has been attributed by some authors, who suggested the probable existence of more than one taxon distinguishable. Studies based on molecular data showed conflicting results regarding the genetic diversity of I. cenchoa. Assuming that genetic differentiation may reflect the morphological variation, the proposition barriers preventing gene flow I. cenchoa can be tested through a careful study of morphological variation in South American populations, addressing and verifying the population patterns and the structure of these patterns. Therefore, this study was organized into three sections: General Introduction, Chapters 1 and 2 In the General. General introduction presents information on chromatic polymorphism in the Imantodini and a brief taxonomic history from the Imantodes cenchoa. In Chapter 1 we discuss the external and internal morphological variation in populations of I. cenchoa (folidose, linear and geometric morphometry, coloration, pattern of saddles and hemipenes), within and between different vegetation types in Brazil, comparing it to the other populations of America South and describe a new species of the Atlantic Forest. In Chapter 2, after the comparative analysis of the material Imantodes South America cis-and trans-Andean, we describe a new species of Imantodes for the Eastern Cordillera of Colombia.